Just to make sure everyone understands...these are *not* being built by Tesla directly. They are contracted out to various electrical companies, some of which complete their contracted work quickly and fly thru inspections, others of which may be building on a slower timeline and/or have more inspection issues which require re-work. For this SC build, for example, there was originally an inspection flag based on some enclosure opening issues (see prior threads), and last week additional inspection flags based on termination issues (likely among other items). Bottom line - while there may be some language in each company's contracts with Tesla which attempt to drive timeline / SLA / etc (I have no first-hand knowledge), these are contracted installations for which the timeline and delays lie with the installer, not with Tesla.
NOTE: This is different than when Tesla sends Tesla employees (dba SolarCity) to your residence to install HPWC...those are indeed Tesla employees generating the plans / doing the install.